Correctly nice and ionice the worker processes.

This had stopped working.
Unfortunately it doesn't seem to help anyway.
Ideally the responsiveness of the interface is the same, regardless
of whether the workers are paused or not. Atm its much better when
they are paused.

install-dependencies

@@ -6,7 +6,7 @@ set -e
 
 echo "Install the dependencies of the vigil script..."
 sudo apt-get --yes install python3-minimal python3-pygments python3-pyinotify \
-     python3-urwid python3-psutil python3-docopt util-linux
+     python3-urwid python3-docopt util-linux
 echo
 echo "Install all the tools vigil may need..."
 ./install-tools

vigil

@@ -918,7 +918,7 @@ def save_state(pickle_path, summary, screen, log):
 def main(root_path, loop, worker_count=None, is_sandboxed=True,
          editor_command=None, is_being_tested=False):
     if worker_count is None:
-        worker_count = multiprocessing.cpu_count() * 2
+        worker_count = multiprocessing.cpu_count()
     pickle_path = os.path.join(tools.CACHE_PATH, "summary.pickle")
     jobs_added_event = asyncio.Event()
     appearance_changed_event = asyncio.Event()

vigil_test.py

@@ -11,8 +11,6 @@ import shutil
 import tempfile
 import unittest
 
-import psutil
-
 os.environ["TERM"] = "xterm-256color"
 
 import fill3
@@ -213,17 +211,12 @@ def _tmp_total():
     return len(os.listdir("/tmp"))
 
 
-def _all_processes():
-    return set(psutil.process_iter())
-
-
 class MainTestCase(unittest.TestCase):
 
     def test_main_and_restart_and_no_leaks_and_is_relocatable(self):
         def test_run(root_path, loop):
             mount_total = _mount_total()
             # tmp_total = _tmp_total()
-            # processes = _all_processes()
             foo_path = os.path.join(root_path, "foo")
             open(foo_path, "w").close()
             vigil.manage_cache(root_path)
@@ -236,7 +229,6 @@ class MainTestCase(unittest.TestCase):
                     self.assertTrue(os.path.exists(".vigil/" + file_name))
             self.assertEqual(_mount_total(), mount_total)
             # self.assertEqual(_tmp_total(), tmp_total)
-            # self.assertEqual(_all_processes(), processes)  # Fix
         temp_dir = tempfile.mkdtemp()
         try:
             loop = asyncio.get_event_loop()

worker.py

@@ -7,15 +7,11 @@ import asyncio
 import os
 import signal
 
-import psutil
-
 import tools
 
 
-def _make_process_nicest(pid):
-    process = psutil.Process(pid)
-    process.nice(19)
-    process.ionice(psutil.IOPRIO_CLASS_IDLE)
+def nice_command(command):
+    return ["nice", "-n", "19", "ionice", "-c", "3"] + command
 
 
 class Worker:
@@ -37,7 +33,7 @@ class Worker:
         else:
             command = [__file__]
         create = asyncio.create_subprocess_exec(
-            *command, stdin=asyncio.subprocess.PIPE,
+            *nice_command(command), stdin=asyncio.subprocess.PIPE,
             stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.PIPE,
             preexec_fn=os.setsid)
         self.process = await create
@@ -53,7 +49,6 @@ class Worker:
     async def job_runner(self, summary, log, jobs_added_event,
                          appearance_changed_event):
         await self.create_process()
-        _make_process_nicest(self.child_pgid)
         while True:
             await jobs_added_event.wait()
             while True: